That's a bug. Fixed for Jmol 12.2.27 and 12.3.27.

On Thu, May 24, 2012 at 4:57 PM, Christopher King <cking@troy.edu> wrote:
Back in March I commented on how the "draw pointgroup" command didn't do what I expected.  Further playing around shows that the scale value can only be set once.  Here are steps to reproduce the problem.

Load a file with the desired symmetry, such as ethane.  (Or, just go to http://wiki.jmol.org/index.php/Jmol_in_Pop-up, and see the behavior there.)
Open the console, and enter "draw pointgroup c3 1 scale 1.5".  One of the C3 axis is displayed, with its axis a bit long, since it is scaled.
Enter "draw pointgroup c3 1 scale 0.8".  Although the scale value is smaller, nothing changes.  Expected behavior:  the axis would become shorter.
Close and restart Jmol (I'm using 12.3.26).
Load the same file.
Enter "draw pointgroup c3 1 scale 0.8".  Notice that the axis is much shorter, since the scale value is smaller.
Enter "draw pointgroup c3 1 scale 1.5".  Although the scale value is larger, nothing changes.  Expected behavior:  the axis would become longer.

It appears that Jmol checks to see if the scale value has been set.  If it has, it doesn't allow the value to be changed, so the only way to change it is to restart the program.  Also, if the first command is, e.g., "draw pointgroup c3 1", then scale is probably given an initial value, because a second command of "draw pointgroup c3 1 scale 1.5" does nothing.



On 3/26/2012 11:42 AM, Robert Hanson wrote:
draw pointgroup is very special -- it creates a whole set of objects. I don't think "scale" is an appropriate keyword, since you have points and lines and planes and such. Jmol wouldn't know what to do with that scale. So you have to go with what it gives you. You could hack it by saving the state, then going in with a text editor and adding the scale to the various DRAW commands that represent all the different elements. Not saying that's a solution....

Bob


On Mon, Mar 26, 2012 at 8:08 AM, Christopher King <cking@troy.edu> wrote:
Good day,
   I’ve loaded the structure of ethane into Jmol 12.3.18.  (The same behavior is also observed athttp://wiki.jmol.org/index.php/Jmol_in_Pop-up.)  The command “draw pointgroup c3 1” nicely displays the C3 axis in this molecule.  If I then do “draw delete; draw pointgroup c3 1 scale 1.2”, nothing changes.  That is, the scale option does not seem to work.  Likewise, “draw delete; draw pointgroup Cs 1 scale 1.2” doesn’t scale a mirror plane.
   Also, “draw ID c3axis pointgroup c3 1” doesn't work, nor does “draw color(blue) pointgroup c3 1”.
   Have I uncovered a bug, or am I just misunderstanding the documentation?
Thanks,
Chris


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Robert M. Hanson
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Robert M. Hanson
Professor of Chemistry
St. Olaf College
1520 St. Olaf Ave.
Northfield, MN 55057
http://www.stolaf.edu/people/hansonr
phone: 507-786-3107


If nature does not answer first what we want,
it is better to take what answer we get.

-- Josiah Willard Gibbs, Lecture XXX, Monday, February 5, 1900